How and why do populations change naturally?

Demographic transition model
1. Population pyramids models
  1. Stage 1: Afghanistan
    1. Birth rate stays equal /w slight increase
      1. No birth control
      2. High infant mortality
      3. Children needed to work
    2. Death rate fluctuates
      1. Diseases
      2. Poor hygiene
      3. No/little health care
      4. Famine/ malnutrition
      5. War/ terrorism
    3. Total population fluctuates
  2. Stage 2: Bangladesh
    1. Birth rates begin to slightly drop
    2. Death rates dramatically decreased
      1. Slightly better housing
      2. Slightly better food/ water
      3. Modest healthcare
      4. Lower infant mortality
  3. Stage 3: Mexicio
    1. Birth rate drops
      1. Birth control
      2. Lower infant mortality
      3. Desire for smaller families
    2. Death rates continue to decrease
    3. Total population rises
  4. Stage 4: UK
    1. Birth rate reaches a low point and fluctuates
    2. Death rate levels off
      1. Improved medical care (NHS)
      2. Good quality housing
      3. Easy access to food/ water
        High wealth compared to LEDCs
  5. Stage 5: Japan
    1. Decreasing birth rate
      1. Change in culture - desire smaller families
    2. Level death rates
      1. Medication becomes advanced
        Natural deaths cause a level but low death rate
    3. Total population decreases
      1. As population hits a high resources cannot be shared equally
        Total population must decrease to survive sustainably
        Out-migration

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How and why do populations change naturally?

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